string _strBatch="<Batch OnError="Continue"> "+
"<Method ID="1" Cmd="New">"+
"<Field Name="Title">Abcdef</Field> "+
"<Field Name="Project_x0020_code">999050</Field>"+
"<Field Name="Status">Open</Field> "+
"</Method>"+
"</Batch>";
CredentialCache.DefaultCredentials;
XmlDocument xmlDoc = new System.Xml.XmlDocument();
XmlElement elBatch = xmlDoc.CreateElement(“Batch”);
“OnError”, “Continue”);
“ListVersion”, “1”);
XmlNode ndReturn = listService.UpdateListItems(_ListName, elBatch);